Public bug reported:
Even though you pick no in the dialog box asking if you want to install
the mp3 codecs it still continues to ask if you want to enable
multiverse and if you say no to that it says there was an error
installing the mp3 codec
** Affects: amarok (Ubuntu)
Importance: Undecided
Status: Unconfirmed
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Insists on installing mp3 codec
https://launchpad.net/bugs/63783